Today in history 2002: Vice President Dick Cheney serves as Acting President for two and a half hours

On this day, June 29th, in 2002, Vice President Dick Cheney served as president for a total of two and a half hours, while President Bush underwent a routine colonoscopy at the Camp David presidential retreat.

According to the National Journal, the 25th Amendment grants the vice president and Cabinet members the power to declare a president disabled, transferring presidential responsibilities to the vice president. It also allows the president to declare himself temporarily unable to perform his duties.